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Measuring Global Trends in the Status of Biodiversity: Red List Indices for Birds

Figure 2

The RLI for All Bird Species in 1988–2004 Compared to Hypothetical Indices

Hypothetical indices show trends if no species had changed category, and if 10% or 50% of species in the categories from Near Threatened to Critically Endangered had been uplisted to a higher category of threat or downlisted to a lower category of threat over the period.

Figure 2

doi: https://doi.org/10.1371/journal.pbio.0020383.g002